Milling cutter



F WIARD.

MILLING CUTTER.

APPLICATION FILED JUNE 4. 1921.

1,428,308. Patentedsept- 5,1922.

A TTORNEY.

Patented Sept. 5, E22. H

" entree era FREDERICK WIARD, E DETROIT, MICHIGAN, ASSiG-NQR '10- AMERICAN STANDARD TOOL COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

rename c'cr'rnn.

Application filed June a,

To all whom it may concern.

Be it known that I, Fnnnnnron Wrnnn, a citizen of the United States, and residing at Detroit, in the county of. Wayne and State of Miohi an have invented a new and Im proved is a speci cation.

his invention relates to milling cutters having teeth adapted to out along their 1ongitudinal top and side edges, and its object 1s to provide tools of this character which can be placed side by side upon a shaft and used for cutting wide grooves and at the same time finish the sides of thegrooves.

In the drawing, Fig. 1 1S a side elevation of one of my improved milling cutters. Fig. 2 is a section on the line 2-2 of Fig. 1. Fig. 3 is a development of a series of teeth I of three adjacent milling'cutters.

Similar reference characters refer to like parts throughout the several views.

The milling cutter shown in Figs. 1 and 2 has a hub 1, a web 2 and teeth 3 whose length is greater than that of the hub. These teeth have the usual cutting side edges-4. and 1ongit-udinal top edges 5 and these teeth taper back to shoulders 6 as indicated in Fig. 8.

I prefer that the remainder of the teeth from the shoulder 6 to the faces 7 of adjacent teeth shall be parallel and the width of these parts-8 shall be such that when similar cutters are placed side by side on the same shaft with their hubs 1 in engagement the side cutting edges 4 of the several teeth will not engage the back portions 8 of these teeth, that 1s, there will be clearance between the side cutting edges 4 of the teeth of the several cutters and the rear portions 8 of the teeth of the adjacent cutters. It will be unusual side-milling cutters are constructed of the hub 1.

derstood that the present cutters are adapted for the ordinary purposes for which the illin Cutter, of which the follow- 1921. Serial no. 475,014.

but th'e possibility of nesting these cutters is the object of the present'invention- .When the cutters and their teeth are positioned as indicated in Fig. 3, the united cutters are adapted for smoothing extended surfaces and for cutting wide grooves, and the outer side edges of the teeth of the outer cutters are adapted to" finish the sides of the grooves in the work. As these side edges wear, they can he reground and in order to retain a tool of suflicient width, thin washers may be placed between the hubs 1 ofLthe adjacent cutters untilthe desired overall width is obtained. As indicated in Fig. 3, considerable grinding is possible before the peeth of the adjacent cutters no longer over Une advanta e of the side-cutting edges on the inner sldes of the teeth of cutters which are grouped as shown in Fig. 3 is that each tooth cuts free the shaving 1t removes along all three edges and thus reduces the power necessary to drive the cutter. As the heaviest wear comes on the outer corners of the teeth of the outer cutters, the present arrangement permits the outer and inner cutters to be exchanged so as to provide new sets of teeth with sharp corners whenever those in use become worn without the necessityof procuring additional cutters or regrinding the original outer cutters. This permits work to be carried on without serious interruption until practically all the cutting edges are worn.. When then reground, these cutters will again have the same number of cutting edges as they had originally.

As shown in Fig. 1, l have formed the hub 1 of the cutter with the keyways 9 and 10 spaced apart the angular distance between any two teeth plus one half the angular distance between adjacent teeth, so that when the cutters are arran ed as shown in Fig. 3, alternate cutters Wlll use the keyways 9 and the others the keyways 10 in order to obtain the positions shown in Fig. 3. This brings the longitudinal top ed es 5 of the teeth'of each cutter midway tween the same edges of the teeth of the adjacent cutter and it also insures clearance between the corners of these teeth and the shoulder 6 of the adjacent cutter. As these cutters are to be grouped interchangeably,

the width of the part 8 plus the-width of the face 7 should be less twice the length V, Whilell have shown a well known cutter tooth, ll do'not wish t6 be limited thereto,

as the invention resides entirely in providing the proper clearance byctorming the backs this is not necessary as these teeth" may. be

i I: tin i and 4 j I their cutting edges so cut away as to permit cut away in any other desired manner so long ,asproperclearanceis afforded, and

jthese'details, as well as those of the other parts or the cutter, may all be changed by I those skilled in the art without departing from the spirit of my invention as set forth in the following claims. p I f llclaiin: l. Milling cutters, each having side-cutteeth all of the same shape and size, having the sides of the teeth hack of the faces otthe teeth of adjacent cutters v to overlap Jcircurnterenti'ally.

7 fee 1 a rallel 2. 'A"mil-ling cutter corn rising ,a circular web' and a-rin of cutting teeth on the web,

the teeth tapering back from the side edges to v shoulders substantially midway between the j "faces of adjacent teeth, the sides of the teeth 3 between said shoulders and adjacent masses teeth 3. 1A milling carat comprising a hub, a circular welo and a ring of cuttin teeth on the web, the hub having acentra bore and two 'longitudinalkeyways spaced apart the angular distance hetweentwo selected teeth plus one half the angular distance hetween two atvi jacent'te'eth. .6 J

' a. Milling cutters, each having side-cut ting teeth, all of the same shape and size, and having the sides of the teeth hack of their cutting edges so cut away as to" permit the faces of the teeth of adjacent cutters to overlap circumferentially, the faces of the teeth of one cutter being positioned midway between the faces of the teeth of the next adjacent cutters; I

I 5. 'Millin cutters axially arranged with the tops 0' the teeth ct alternate cutters alined and the tops vof the teeth of adjacent cutters overlapping circumferentially and all the teeth of each cutter beingalike- 6 Milling cutters axially arranged and each having both sides of its teeth provided with side-cutting edges, the sides of said teeth being'so cut away as to permit the tops-of the teeth of adjacent cutters to extend across the sameplane and all the teeth of each cutter being alike.

' FREDERICK WllARD." 

